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Figure 2. Representative Look-Locker sequence MR images (3000/2.5; flip angle, 10°) obtained with a long-axis view of the heart. In the first image obtained after the inversion pulse (top left), the injection site cannot be differentiated from remote myocardium. The image acquired 228 msec after the inversion pulse (delay time after inversion pulse is in upper left corner of each image) shows the injection site (arrow) as dark because of faster zero crossing after intramyocardial injection of 0.10 mmol/mL gadodiamide solution at the injection site compared with remote myocardium. In consecutive images, the myocardium at the injection site gains bright signal intensity due to a shorter T1 value. The remote myocardium is dark at approximately 468 msec, corresponding to a T1 value of 885 msec ± 9 for myocardium. LV = left ventricle, RV = right ventricle.
